LXR linux/include/linux/virtio

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_VIRTIO_VSOCK_H
   3#define _LINUX_VIRTIO_VSOCK_H
   4
   5#include <uapi/linux/virtio_vsock.h>
   6#include <linux/socket.h>
   7#include <net/sock.h>
   8#include <net/af_vsock.h>
   9
  10#define VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE        (1024 * 4)
  11#define VIRTIO_VSOCK_MAX_BUF_SIZE               0xFFFFFFFFUL
  12#define VIRTIO_VSOCK_MAX_PKT_BUF_SIZE           (1024 * 64)
  13
  14enum {
  15        VSOCK_VQ_RX     = 0, /* for host to guest data */
  16        VSOCK_VQ_TX     = 1, /* for guest to host data */
  17        VSOCK_VQ_EVENT  = 2,
  18        VSOCK_VQ_MAX    = 3,
  19};
  20
  21/* Per-socket state (accessed via vsk->trans) */
  22struct virtio_vsock_sock {
  23        struct vsock_sock *vsk;
  24
  25        spinlock_t tx_lock;
  26        spinlock_t rx_lock;
  27
  28        /* Protected by tx_lock */
  29        u32 tx_cnt;
  30        u32 peer_fwd_cnt;
  31        u32 peer_buf_alloc;
  32
  33        /* Protected by rx_lock */
  34        u32 fwd_cnt;
  35        u32 last_fwd_cnt;
  36        u32 rx_bytes;
  37        u32 buf_alloc;
  38        struct list_head rx_queue;
  39};
  40
  41struct virtio_vsock_pkt {
  42        struct virtio_vsock_hdr hdr;
  43        struct list_head list;
  44        /* socket refcnt not held, only use for cancellation */
  45        struct vsock_sock *vsk;
  46        void *buf;
  47        u32 buf_len;
  48        u32 len;
  49        u32 off;
  50        bool reply;
  51        bool tap_delivered;
  52};
  53
  54struct virtio_vsock_pkt_info {
  55        u32 remote_cid, remote_port;
  56        struct vsock_sock *vsk;
  57        struct msghdr *msg;
  58        u32 pkt_len;
  59        u16 type;
  60        u16 op;
  61        u32 flags;
  62        bool reply;
  63};
  64
  65struct virtio_transport {
  66        /* This must be the first field */
  67        struct vsock_transport transport;
  68
  69        /* Takes ownership of the packet */
  70        int (*send_pkt)(struct virtio_vsock_pkt *pkt);
  71};
  72
  73ssize_t
  74virtio_transport_stream_dequeue(struct vsock_sock *vsk,
  75                                struct msghdr *msg,
  76                                size_t len,
  77                                int type);
  78int
  79virtio_transport_dgram_dequeue(struct vsock_sock *vsk,
  80                               struct msghdr *msg,
  81                               size_t len, int flags);
  82
  83s64 virtio_transport_stream_has_data(struct vsock_sock *vsk);
  84s64 virtio_transport_stream_has_space(struct vsock_sock *vsk);
  85
  86int virtio_transport_do_socket_init(struct vsock_sock *vsk,
  87                                 struct vsock_sock *psk);
  88int
  89virtio_transport_notify_poll_in(struct vsock_sock *vsk,
  90                                size_t target,
  91                                bool *data_ready_now);
  92int
  93virtio_transport_notify_poll_out(struct vsock_sock *vsk,
  94                                 size_t target,
  95                                 bool *space_available_now);
  96
  97int virtio_transport_notify_recv_init(struct vsock_sock *vsk,
  98        size_t target, struct vsock_transport_recv_notify_data *data);
  99int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk,
 100        size_t target, struct vsock_transport_recv_notify_data *data);
 101int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk,
 102        size_t target, struct vsock_transport_recv_notify_data *data);
 103int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk,
 104        size_t target, ssize_t copied, bool data_read,
 105        struct vsock_transport_recv_notify_data *data);
 106int virtio_transport_notify_send_init(struct vsock_sock *vsk,
 107        struct vsock_transport_send_notify_data *data);
 108int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk,
 109        struct vsock_transport_send_notify_data *data);
 110int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk,
 111        struct vsock_transport_send_notify_data *data);
 112int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk,
 113        ssize_t written, struct vsock_transport_send_notify_data *data);
 114void virtio_transport_notify_buffer_size(struct vsock_sock *vsk, u64 *val);
 115
 116u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk);
 117bool virtio_transport_stream_is_active(struct vsock_sock *vsk);
 118bool virtio_transport_stream_allow(u32 cid, u32 port);
 119int virtio_transport_dgram_bind(struct vsock_sock *vsk,
 120                                struct sockaddr_vm *addr);
 121bool virtio_transport_dgram_allow(u32 cid, u32 port);
 122
 123int virtio_transport_connect(struct vsock_sock *vsk);
 124
 125int virtio_transport_shutdown(struct vsock_sock *vsk, int mode);
 126
 127void virtio_transport_release(struct vsock_sock *vsk);
 128
 129ssize_t
 130virtio_transport_stream_enqueue(struct vsock_sock *vsk,
 131                                struct msghdr *msg,
 132                                size_t len);
 133int
 134virtio_transport_dgram_enqueue(struct vsock_sock *vsk,
 135                               struct sockaddr_vm *remote_addr,
 136                               struct msghdr *msg,
 137                               size_t len);
 138
 139void virtio_transport_destruct(struct vsock_sock *vsk);
 140
 141void virtio_transport_recv_pkt(struct virtio_transport *t,
 142                               struct virtio_vsock_pkt *pkt);
 143void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt);
 144void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt);
 145u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 wanted);
 146void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit);
 147void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt);
 148
 149#endif /* _LINUX_VIRTIO_VSOCK_H */
 150